Python console application which calculates hours spent on task given in argument

odesk_task_hours.py

import sys
import odesk
from odesk import Q
from datetime import datetime, timedelta
import shelve
import os

# add your desktop app keys
public_key = ''
secret_key = ''

storage_path = os.path.join(os.environ['HOME'], '.task_hours.shelve')
storage = shelve.open(storage_path)

def get_client():
    client = odesk.Client(public_key, secret_key)
    auth_token = storage.get('auth_token')
    if auth_token is None:
        # perform auth process
        frob = storage.get('frob')
        if frob is None:
            frob = client.auth.get_frob()
            storage['frob'] = frob
            print "Please, authorize application using the URL:\n%s" % \
                  client.auth.auth_url(frob)
            sys.exit(1)
        try:
            auth_token, user = client.auth.get_token(frob)
        except Exception, e:
            print "Could not get auth token: %s" % e
        else:
            storage['auth_token'] = auth_token
            storage['user'] = user
        finally:
            del storage['frob']

    if auth_token is None:
        sys.exit(1)

    client = odesk.Client(public_key, secret_key, auth_token)
    return client


if __name__=='__main__':
    task = sys.argv[1]

    try:
        worked_from = sys.argv[2]
    except IndexError:
        # set week back default
        worked_from = datetime.now().date() - timedelta(days=7)

    client = get_client()

    report = client.time_reports.get_provider_report(
        'sergray',
        odesk.Query(
            select=odesk.Query.DEFAULT_TIMEREPORT_FIELDS,
            where=(Q('task')==task) & (Q('worked_on') > worked_from)
        )
    )

    storage.close()

    print sum(map(lambda r: float(r['c'][-1]['v']), report['table']['rows']))